Last week, I identified five hitters whose batted ball distance suggested better HR/FB rate days may be ahead and another five hitters who may be in for a sudden HR/FB rate decline. That’s one way to use a hitter’s average home run and fly ball distance — as a predictive metric to speculate on improvers and regressers moving forward. The other use is to validate as a backwards looking tool. Player X’s HR/FB rate has declined, has his batted ball distance plummeted as well? The batter is seemingly at greater risk of maintaining that decreased HR/FB rate if it came with a similar trend in his distance. Of course, he may improve the distance, in which case the HR/FB rate would rebound. But we still want to see the two match up.